What is the passage mainly about? [br] According to the US National Heart, Lung

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问题 What is the passage mainly about? [br] According to the US National Heart, Lung and Blood Institute, the reason why older mothers’ children tend to be obese remains ______ .

选项

答案 not entirely clear

解析 根据题干中的US National Heart,Lung and Blood Institute定位至第六个小标题下第二段,再根据题干其他信息the reason why older mothers’ children tend to be obese remains,准确定位至该段最后一句:why this should be so is not entirely clear,remains与is的语法功能及意思一致,因此可填入not entirely clear。
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